Pump



Jan. 7, 1947. wgw. TAYL-.oR 2,413,851

n rma? Fileduuy s, 194s IN1/mum,r WALTER n'. TAYLOR.

WF MW Arron/ven `bination of a rigid drive and a Patented Jan. 7, 1947 lPUMP Walter W. Taylor, -Oakland, Calif., assignor to sbary ManufacturCalif., a eo-partnership Application July 3, 1945. serial'No. 603,069

'I'he present invention relates to improvements in pumps, and hasparticular reference to a double pump arrangement whereby two diferentliquids may be pumped to a common destination in separate paths.

My pump arrangement is particularly intendedto be used in connectionwith a cleaning machine for motor vehicles, such as is disclosed in theMalsbary et al. Patent No. 2,295,228. `Inthis patent it is proposed toprovide a singiepump for-pumping from two tanks, one containing clearwater and Ythe other a concentrated cleaning solution, to-

ward a'. heating coil for nai discharge through a hose and a nozzle.

It was'found. subsequently that a diluted cleaning solution passingthrough a pump had certain injurious eiects on the pump while aconcentrated solution might pass through a' pump without such etIect.

It was proposed, therefore, in the co-pending application, Ser. No.549,973, to provide twol f pumps, one for the clear water and one forthe concentrated solution, both pumping toward the same coil.

It was further proposed, in the interest of economyand coordination, tointerconnect the two pumps so thatv one would drive the other, throughthe medium of a uid drive between the two pumps, wherebythereciprocating motion of the piston of the larger water pump would betransmitted tothe reciprocating element of the smaller solution pump,which latter was pre-l sented as a diaphragm pump.

It was found, however, that a plain tluid drive between the tworeciprocating members was un.- satisfactory in certain respects onaccount of pressure losses, lwhich would cause the diaphragm pump todevelop less pressure .than the main pump. This would make it impossibleto force the diaphragm pump discharge into the main pump discharge, inthe absence of compensating factors.

In the present invention it is proposed to provide a more positive drivebetween the reciprocating members of the pumps, comprising a comiluiddrive whereby the advantages of the fluid drive and the disadvantagesare eliminated.

It is further proposed to introduce a compensating feature wherebyexcess pressures due 'to the rigidv drive member are relieved andwhereby the delivery of the auxiliary pump may be made sub lect tomanual control.

Further objects and advantages of my invention will appear as thespecification proceeds. and

9 Claims. (Cl. 103-9) ing Company, Oakland,

, i 2- the novel features of the same will be f ully dened in the claimshereto attached. Y

The preferred form of Athel invention is illustrated in the accompanyingdrawing forming part of this application, in which:

Figure 1 shows a vertical section through myv pump arrangement;

Figure 2, a horizontal section through the dia phragm pump, taken alonglinev 2 2' of Figure 1; and

FigureV 3, a face view of one of the castings used in my diaphragm pump,as seen from line 3 3 of Figure 1.

While I have shown only the preferred form of my invention, it should beunderstood that various changes or modication's may be made within thescope of the claims hereto attached without departing from the spirit ofthe invention. -More particularly, I wish to point out that while .Ihave shown the main pump asa piston pump and the auxiliary pump as adiaphragm pump, anysuitable reciprocating pump may be substituted foreither oi' them.

Referring to the drawing in detail, my pump arrangement comprises, inits principal features, a main pump i and an auxiliary pump 2. The mainpump may be of any suitable form and is here shown as comprising a pumphousing 3 havare retained ingk a piston 4 reciprocable therein andhaving a pump chamber 5, with suitable intake and discharge valves 6 and1.

'I'he pump is designed'particularly for use in connection with acleaning machine such as is described in the patent aforesaid and isintended for pumping clear water from a suitable supply, such as awatertank, to a heating coil for discharge through a nozzle. It is ofthe high pressure type and discharges at a pressure of 300 to 400pounds.

lThe main pump is provided, opposite and in alinement with its piston,with a gland 8 having a restricted throat section 9, and a pipe I0, oflarger diameter than the'throat, is threaded into the gland, as shown atIl, the pipe being axially alined with the piston'.

The diaphragm pump comprises in its principal features a pair of similarannular castings I2-i3 clamped upon the rim of a diaphragm il by meansof bolts I5, the castings having concave municates, through a series ofcentralperforations 22, with the chamber' II. The passage also passage20, and through perforations -communicates with chamber I8 at thehighest and lowest points of the latter, through inclined ports 23-24,allowing air and dirt to escape from the chamber. l

The diaphragm pump is connected to the main pump by being threaded onthe pipe I3, as at 25, the'pipe thus directly connecting with the 22, 23and 24, with the chamber I8.

The casting I3 is shaped similarly to casting I2, and has a verticalpassage 26 communicating with the chamber I9 through perforationsgrouped about the centerline of the pump and ports 2li- 29, inclined toallow air to escape-` through the upper ports and dirt through'th'e'g,y

lower ones.-

One end of the passage at 30, while the other end is preferably used toconnect with the discharge valve 3|.. AA suitable intake Valve 32 may beprovided on the outer face of the second casting.

' The discharge valve delivers into pipe 33, which is preferablyprovided with a metering valve 34. The piston 4 has a plunger 35 securedupon the end thereof and the plunger projects through the pump chamber 5and the throat 9 of the gland 8 into the pipe IIl, which latter may beconsidered as forming part of the diaphragm pump chamber I8.

The throat 9 is of a diameter slightly in excess of that of the plunger,so as to leave a slight clearance or leakage about the plunger, theclearance 26 may be plugged, as

' being preferably about five-thousandths ofan .The piston Il isreciprocated,`by any suitable means, through the connecting rod 36.

The intake 32 of the diaphragm pump, in the cleaning machine referredto, is connected to a solution tank, and the discharge 3| connects intothe main pump discharge. 4

In operation, asthe piston 4 is reciprocated, it

` draws in a charge of water through intake valve 6 on the suctionstroke, and discharges water through valve 1 on the drive stroke.Disregard-v ing the plunger 35, the piston would also draw on thediaphragm I4 on the suction stroke, creating a vacuum in chamber I9 anddrawing in a charge of solution through the intake valve 32. On th'e 1drive stroke,the piston, disregardlng the plunger,l

would create pressure on the diaphragm and" force the latter intochamber I9 for discharging the liquid therefrom through valve 3l.

Thus, even in the absence of the plunger 35, the piston 4 would causethe diaphragm to recipvrcate with the piston, but the movement of thediaphragm would be relatively feeble, since on the suction stroke of thepiston valve 6 opens, and on the drive stroke valve 1 opens to relievethe vacuum and the pressure.

Thus the diaphragm pump, in the absence of compensating features, woulddischarge at a pressure lower than that of the main pump and would beunable to force its discharge into the main pump discharge.

The plunger 35 is designed to produce a more positive. drive for thediaphragm. It substantially separates chamberv I8 of the diaphragm pumpfrom chamber 5 of the main pump, and if the fit of the throat 9 aboutthe plunger were leak proof, the action on the diaphragm would besubstantially as positive as the action of the piston on the liquid inthe main pump chamber.

But, 'this' action -would be too severe, in the ab- "sence ofranycushioning means or relief outlet. "4Qnthe suction stroke, the suctionwould not only pull the diaphragm i-ntocontact with the conthe waterpast the rim of the diaphragm to the outside of the pump.

The small clearance lor leakage about the plunger remedies this defect,because it allows the pressures to equalize on opposite sides of thethroat 9 while still maintaining substantially the same pressures inboth pump chambers 5 and I9.

On the suction stroke, if an empty space should develop in the passage.20, which would tend to suck the diaphragm material into theperforations, enough water will leak past the throat 9 to ll the space.In view of the low pressure diierential on the suction stroke, the waterwill not begin to leak through until the diaphragm has reached the limitof its travel.

On the pressure stroke the piston 4 drives the plunger 35 into the waterand drives the diaphragm against the concave face of'casting I3 toexhaust the charge from chamber I9. If any excessive pressure developswhen the diaphragm reaches the limit of its stroke, water will leak backpast the throat 9 into pump chamber 5, thus relieving the pressure inthe diaphragm pump. It will be observed that the pressure in thediaphragm pump will still be the same as that in the main pump, sinceonly excess pressure is relieved.

The leak at the throat 9 further adapts the diaphragm. pump for controlof its output by means of the metering valve 3l. As the latter valve isclosed down to reduce the output, the travel of the diaphragm becomesmore limited .and more water is. made to leak past the plunger. vTheleak automatically limits the building up of pressure in the diaphragmbeyond that of the main pump.

If the metering valve is closed altogether, all the water will leak pastthe throat in both directions and the diaphragm will remain unaected bythe movements of the plunger.

by ether means than those shown, as by small ppehings in the plunger orin the gland.

I claim:

l. In combination, a pump having a chamber and a piston reciprocable forpumping a liquid through the chamber, a second pump having a diaphragmand chamberson oposite sides thereof, the diaphragm being adapted forpumping a liquid through one of the chambers, a pipe connection betweenthe first pump chamber' and the second diaphragm chamber for admittingliquid into the latter,l and a plunger fixed to the piston andprojecting into the pipe for operating the diaphragm through the liquid.

2. In combination, a pump having a chamber and a piston reciprocable forpumping a liquid through the chamber, a second pump having a diaphragmand chambers on opposite sides thereof. the diaphragm being adapted forpumping a liquid through one of the chambers, a pipe connection betweenthe iirst pump chamber and the second diaphragm chamber for admittingliquid into the latter, and a plunger fixed to the piston and projectinginto the pipe for operating the diaphragm through the liquid, the pipeand the plunger being constructed to provide a slight leakage betweenthe same for filling excess space in the second diaphragm chamber on thesuction 7 5 stroke.

, It is apparent that the leakage may be obtained 3. In combinationQapump having a chamber and a piston reciprccable for pumping a. liquidthrough the chamber, a second pump having a diaphragm and chambers onopposite sides thereof, the diaphragm being adapted for pumping a liquidthroughpne of the chambers, a pipe connection betweenfthe rst pumpchamber and the second diaphragm chamber for admitting liquid into thelatter, and a plunger xed to the piston and projecting into the pipe foroperating the diaphragm through the liquid, the pipe and the plungerbeing constructed to provide a slight leakage between the same fordischarging excess liquid in the second diaphragm chamber on thepressure stroke into the rst pump chamber.

4. In combination, a pump having a chamber and a, pistonreciprocable forpumping a liquid through the cham-ber, a second pump having a diaphragmand chambers on opposite sides thereof, the diaphragm being adapted forpumping a liquid through one of the chambers, a pipe connection betweenthe rst pump chamber and the.

second diaphragm chamber for admitting liquid into the latter, and aplunger xed to the piston and projecting into the pipe'for operating thediaphragm through the liquid, the pipe and the plunger being constructedto provide a slight leakage between the same for equalizing pressures onopposite sides of the leakage.

`5. In combination, a pump having a chamber and a piston reciprccablefor pumping a liquid through the chamber',l a second pump having adiaphragm and chambers on opposite sides thereof, the diaphragm beingadapted for pumping a liquid through one of the chambers, a pipeconnection between the first pump chamber and the second diaphragmchamber for admitting liquid into the latter, and a plunger xed to thepiston and projecting into the pipe for operating the diaphragm throughthe liquid, the pipe and the plunger being constructed to provide aslight leakagebetween the same, and a metering valve for controlling theoutput of the second chamber, the leakage causing an equalizing ofpressure onopposite sides thereof for any adjustment of themetering-valve.

6. In combination, a pump `having a chamber and a piston reciprccabletherein for pumping a liquid through th chamber, a second pump having adiaphragm and chambers on opposite sides thereof, the diaphragm beingadapted for pumping a liquid through one of the chambers, a pipeconnection between the rst pump chamber and the .second diaphragmchamber for admitting liquid into the latter, and a plunger xed to thepiston and operable in the pipe with a slight leakage "for operating thediaphragm through the liquid and for equalizing pressures on oppositesides of the leakage. i

7. In combination, a pump having a. chamber and a member reciprccabletherein for pumping a liquid through the chamber, a second pump havinga. reciprocable member and chambers on opposite sides thereof, thelattermember being adapted for pumping a liquid through prie of thechambers, a restricted connection between the Afirst pump chamber andthe second chamber of the second pump forl admitting liquid into thelatter, and a plunger fixed to the piston' and operable in theconnection for operating the second member through the liquid;

8. In combination, a pump having a chamber and a member reciprccabletherein for pumping a liquid through the chamber, a second pump having areciprccable member and chambers on opposite sides thereof, the lattermemberbeing adapted for pumping a liquid through one of the chambers, arestricted connection between the rst pump chamber and thesecond'chamber of the second pump for admitting'liquid into the latter,and a plunger flxedtothe piston and operable in the connection forvoperating the second member through the liquid, the plunger beingoperable in the connection with a slight leakage for equalizingpressures on opposite sides of the' leakage. 'i

9. In combination, a pump having a chamber and a piston reciprccabletherein for pumping a liquid through the chamber, a second pump having apump chamber and a diaphragm subject to liquid pressures in the iirstchamber for pumping a liquid through the second chamber,I a meteringvalve for controlling the output of the second pump chamber, and meansfor substantially equalizing the pressures in the two chambers atdierent settings of the metering valve.

WALTER w. TAYLoR.

